CN202486207U - Three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system - Google Patents
Three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system Download PDFInfo
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- CN202486207U CN202486207U CN 201220113838 CN201220113838U CN202486207U CN 202486207 U CN202486207 U CN 202486207U CN 201220113838 CN201220113838 CN 201220113838 CN 201220113838 U CN201220113838 U CN 201220113838U CN 202486207 U CN202486207 U CN 202486207U
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Abstract
The utility model relates to a three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system. The module comprises a U phase network voltage sampling circuit, a V phase network voltage sampling circuit, a W phase network voltage sampling circuit and an any phase zero crossing capture circuit, wherein each phase network voltage sampling circuit is used for converting a network voltage into a voltage signal adapted to AD (analog-to-digital) conversion by a processor chip; the zero passage capture circuit is used for converting the zero crossing point signal of the corresponding phase network into a digital level for transmission to a capture unit in a process; the input parts of the three phrase networks only need to be connected to the inputs of three U, V and W live wires, and do not need to be connected to zero lines, and the zero crossing capture circuit of the output part only needs one phase zero crossing capture. By using the three phrase network voltage sample module, the processor can conveniently and precisely calculate the amplitude value, the phase and the frequency of the three phrase network voltage, and three phases in one network and phase locking are realized, and sampling wiring quantity and miswiring probability of the system can be reduced, and the PCB (Printed Circuit Board) area is reduce.
Description
Technical field
The utility model relates to three phase network voltage sample module, relates in particular to the three-phase alternating voltage sampling module that a kind of photovoltaic DC-to-AC converter or wind energy converter system use.
Background technology
Photovoltaic power generation technology utilizes solar cell effectively to absorb solar energy exactly, and makes it to be converted into electric energy.Contain in the product of the function that is incorporated into the power networks at photovoltaic DC-to-AC converter; Be incorporated into the power networks electric voltage frequency, phase place, amplitude of requirement must be consistent with line voltage frequency, phase place, amplitude; Particularly in the three phase network system; Requirement is more reliably arranged, therefore, design a kind of stable and reliable operation photovoltaic DC-to-AC converter three-phase alternating voltage sampling module; Electric voltage frequency when assurance is incorporated into the power networks, phase place, amplitude and line voltage frequency, phase place, amplitude are consistent, have crucial meaning for the photovoltaic DC-to-AC converter safe and stable operation that contains the function that is incorporated into the power networks.
At present, ac grid voltage sample circuit form commonly used on the photovoltaic DC-to-AC converter is many, mainly comprises: the sampled form that 1) contains step-down isolation transformer; 2) contain electrorheological than the sampled form that is the current transformer of 1:1; 3) difference channel sampled form.Above-mentioned ac grid voltage sample circuit is in applying to the three-phase photovoltaic system time; Normally select three monomer sample circuits to combine, three monomer sample circuit input ends connect each the phase circuit in the three-phase photovoltaic system respectively, and output terminal connects microprocessor; Three monomer sample circuits dispose one road signal zero passage capture circuit respectively; Wiring is complicated like this, and the MPI that takies is more, and cost is higher relatively.
Summary of the invention
In view of this, the utility model provides a kind of photovoltaic DC-to-AC converter and wind energy converter system three phase network voltage sample module.
The technical scheme of the utility model is following:
A kind of photovoltaic DC-to-AC converter and wind energy converter system three phase network voltage sample module; Comprise U phase line voltage sample circuit, V phase line voltage sample circuit, W phase line voltage sample circuit, also comprise any one circuit in U phase zero passage capture circuit or V phase zero passage capture circuit or the W phase electrical network zero passage capture circuit.Wherein, Said U phase line voltage sample circuit, V phase line voltage sample circuit, W phase line voltage sample circuit have zero line input end and live wire input end respectively; Three sample circuit zero line input ends link together; The live wire input end connects U phase electrical network, V phase electrical network and W phase electrical network respectively, and the output terminal of three sample circuits is the connection processing device respectively; Said U phase zero passage capture circuit or V phase zero passage capture circuit or W phase electrical network zero passage capture circuit input end connect this corresponding phase electrical network live wire of AC network, and output terminal connects microprocessor.
Concrete, said U phase line voltage sample circuit, V phase line voltage sample circuit, W phase line voltage sample circuit adopt contain the step-down isolation transformer sample circuit contain the current transformer sample circuit or the difference sample circuit in any one or a few.
Preferably, said U phase or V phase or W phase line voltage sample circuit include a current transformer and accurate binary channels transport and placing device; 2 pin of each mutual inductor link to each other; Each line voltage produces certain electric current through current-limiting resistance; This current signal at the onesize current signal of the secondary generation of current transformer, is imported the reverse input end of accurate binary channels amplifier through the former limit of current transformer again through sampling resistor; Then produce the bipolarity ac sine wave voltage of certain amplitude at the output terminal of accurate binary channels amplifier; This bipolarity ac sine wave voltage converts the unipolarity sine wave signal into through resistance, exports to the AD ALT-CH alternate channel input port sampling of processor chips, is calculated the line voltage amplitude of corresponding phase by processor chips.
Preferably; Said zero passage capture circuit comprises an amplifier and a comparer, and the bipolarity ac sine wave voltage that the line voltage sample circuit produces is exported simultaneously, carries out equivalence oppositely through this amplifier; Signal after reverse is input to this comparer in-phase input end through protective resistance and filter capacitor; Make the zero potential of the reverse input end of itself and comparer compare back output, connect at this comparator output terminal and draw resistance, then this comparator output terminal produces the square-wave signal with the line voltage homophase; Supply with the mouth of catching of processor chips and catch, processor chips obtain the phase place and the frequency of line voltage respectively according to the calculated signals of catching.
Compared with prior art, the beneficial effect of the utility model is:
In three-phase photovoltaic DC-to-AC converter system or wind energy converter system, the three phase network voltage sample module that the utility model provides can reduce the access of three electrical network N lines at the input end of sampled signal, has reduced the possibility of system's assembly work amount and false wiring; In addition, three road voltage sampling circuits can only dispose one and pass by zero capture circuit, make the controlling object of host processor chip reduce, and only need be incorporated into the power networks frequency, phase place, the amplitude of frequency, phase place, amplitude and line voltage of voltage of control one road to be consistent; Circuit is succinct, reduces the PCB area.
Description of drawings
Fig. 1 is the utility model first embodiment modular structure synoptic diagram;
Fig. 2 is the utility model second embodiment modular structure synoptic diagram;
Fig. 3 is the utility model the 3rd embodiment modular structure synoptic diagram;
Fig. 4 is the utility model the 4th embodiment modular structure synoptic diagram;
Fig. 5 is the utility model specific embodiment circuit theory synoptic diagram.
Embodiment
Combine accompanying drawing that the utility model is done further to specify through embodiment below.
As shown in Figure 1; Be first embodiment of said photovoltaic DC-to-AC converter and wind energy converter system three phase network voltage sample module, said module comprises U phase line voltage sample circuit, V phase line voltage sample circuit, W phase line voltage sample circuit and U phase electrical network zero passage capture circuit.Wherein each phase line voltage is delivered to sample circuit input end separately, after over-sampling circuit is handled, delivers to the analog to digital conversion passage of processor chips, obtains the amplitude of each phase line voltage after being calculated by processor.Wherein the sampled signal of U phase is also delivered to U phase electrical network zero passage capture circuit; Deliver to the passage of catching of processor chips by the signal of this capture circuit acquisition U phase electrical network; By the frequency and the phase place that obtain U phase electrical network after the processor chips calculating; According to the characteristic of three phase network phase phasic difference 120 degree, can obtain the frequency and the phase place of each phase line voltage.
Referring to Fig. 2; Second embodiment forms schematic block diagram for the utility model; Select V electrical network sampled signal mutually with the zero passage capture circuit that is not both of first embodiment; Through the zero passage lock-on signal of V phase zero passage capture circuit generation V phase, obtain the frequency and the phase place of each phase line voltage at last by the processor chips computing.
Referring to Fig. 3; Be the utility model the 3rd embodiment; Select W phase sampler signal with the zero passage capture circuit that is not both of second embodiment,, obtain the frequency and the phase place of each phase line voltage at last by the processor chips computing through the zero passage lock-on signal of W phase zero passage capture circuit generation W phase.
Referring to Fig. 4; Be the utility model the 4th embodiment; With the zero passage capture circuit that is not both of first three embodiment U, V, W three-phase are set; Three phase network voltage is collected the frequency and the phase place of each phase line voltage at last through the zero passage lock-on signal of each each phase of phase zero passage capture circuit generation by processor chips.When the three phase network Voltage unbalance, the method can increase the stability of photovoltaic DC-to-AC converter system or wind energy converter system.
Referring to Fig. 5, be the utility model one specific embodiment circuit theory synoptic diagram.Among this embodiment; Said sampling module comprises the line voltage sample circuit; Each line voltage sample circuit includes a current transformer and an accurate binary channels transport and placing device; Said current transformer secondary coil is connected with protective resistance between the two ends, is connected with building-out capacitor between accurate binary channels amplifier reverse input end and the output terminal.Like figure; Wherein 2 pin of mutual inductor T1, T2, T3 link to each other, and U phase line voltage produces the electric current less than 2mA through current-limiting resistance R1 and R2, and this current signal is through accurate current transformer T1; The onesize current signal of secondary generation and former limit at T1; Pass through sampling resistor R5, accurate binary channels amplifier A1 A again, at the 1 pin generation-3.3V of the A1A bipolarity ac sine wave voltage to+3.3V, this sine voltage converts 0 ~ 3.3V sine wave signal into through resistance R 9, R10; Offer the AD ALT-CH alternate channel input port sampling of processor chips, calculate the amplitude of U phase line voltage by processor chips.C1 is a building-out capacitor among the figure, and resistance R 3 is used for the protective current mutual inductor.On the other hand; The bipolarity ac sine wave voltage that 1 pin of A1 produces also carries out equivalence oppositely through resistance R 6, R7 and amplifier A1B; The 7 pin output that makes A1 and U be the synchronous voltage signal of line voltage mutually; This signal is incorporated into input end 2 pin of comparator C M1 through protective resistance R8 and filter capacitor C3, compares with the zero potential of 3 pin, and the CM1 output terminal connects and draws resistance R 12; Then produce square-wave signal with the line voltage homophase at the output terminal of comparator C M1 and offer catching of processor chips and mouthful catch, processor chips obtain the phase place and the frequency of other line voltage according to the calculated signals that captures.Resistance R 11 and diode D1 circuit by way of compensation among the figure.Be connected to compensating circuit between said comparator C M1 in-phase input end and the output terminal; This compensating circuit comprises resistance R 11, diode D1; Resistance R 11 1 termination comparator C M1 in-phase input ends, another terminating diode D1 negative pole, diode D1 positive pole connects comparator C M1 output terminal.
In like manner, V phase line voltage produces the electric current less than 2mA through current-limiting resistance R13 and R14, and this current signal is through accurate current transformer T2; The onesize current signal of secondary generation and former limit at T2; Pass through sampling resistor R17 again, accurate binary channels amplifier A2B is at the 7 pin generation-3.3V of the A2 bipolarity ac sine wave voltage to+3.3V; Wherein capacitor C 4 is done compensation, and resistance R 15 is done the protection of current mode mutual inductor.The bipolarity ac sine wave voltage that produces converts 0 ~ 3.3V sine wave signal into through resistance R 18, R19, offers the AD ALT-CH alternate channel input port sampling of processor chips, and processor chips calculate the amplitude of U phase line voltage according to sampled signal.W phase line voltage produces the electric current less than 2mA through current-limiting resistance R20 and R21; This current signal is through accurate current transformer T3, and the onesize current signal of secondary generation and former limit at T3 passes through sampling resistor R24 again; The A part of accurate binary channels amplifier A2; At the 1 pin generation-3.3V of the A2 bipolarity ac sine wave voltage to+3.3V, wherein capacitor C 5 is done compensation, and resistance R 22 is done the protection of current mode mutual inductor.The bipolarity ac sine wave voltage that produces converts 0 ~ 3.3V sine wave signal into through resistance R 25, R26, offers the AD ALT-CH alternate channel input port sampling of processor chips, and processor chips calculate the amplitude of U phase line voltage according to sampled signal.
The described three phase network voltage sample of the utility model module is applicable in photovoltaic DC-to-AC converter system and the wind energy converter system, and is special in photovoltaic DC-to-AC converter that contains the function that is incorporated into the power networks and wind energy converter system, can well be used.
The utility model is except that embodiment illustrated in fig. 5; Can also adopt step-down isolation transformer form, difference sample circuit form, be equal to or the sample circuit of equivalent transformation circuit structure form; Its input, three phase network voltage sample module that the output terminal connected mode is identical with the utility model all belong to the protection domain of the utility model.
Claims (6)
1. photovoltaic DC-to-AC converter and wind energy converter system three phase network voltage sample module comprise U phase line voltage sample circuit, V phase line voltage sample circuit, W phase line voltage sample circuit; It is characterized in that; Said U phase line voltage sample circuit, V phase line voltage sample circuit, W phase line voltage sample circuit have zero line input end and live wire input end respectively; Three sample circuit zero line input ends link together; The live wire input end connects U phase electrical network, V phase electrical network and W phase electrical network respectively, and the output terminal of three sample circuits is the connection processing device respectively;
Also comprise any one circuit or three kinds of circuit in U phase zero passage capture circuit or V phase zero passage capture circuit or the W phase electrical network zero passage capture circuit;
Said U phase zero passage capture circuit or V phase zero passage capture circuit or W phase electrical network zero passage capture circuit input end connect this corresponding phase electrical network live wire of AC network, and output terminal connects microprocessor.
2. photovoltaic DC-to-AC converter according to claim 1 and wind energy converter system three phase network voltage sample module; It is characterized in that said U phase line voltage sample circuit, V phase line voltage sample circuit, W phase line voltage sample circuit adopt and contain the sample circuit of step-down isolation transformer or contain the sample circuit of current transformer or in the difference sample circuit any one or a few.
3. photovoltaic DC-to-AC converter according to claim 1 and wind energy converter system three phase network voltage sample module is characterized in that, said U phase or V phase or W phase line voltage sample circuit include a current transformer and accurate binary channels transport and placing device;
2 pin of each mutual inductor link to each other; Each phase line voltage produces certain electric current through current-limiting resistance; This current signal at the onesize current signal of the secondary generation of current transformer, is imported the reverse input end of accurate binary channels amplifier through the former limit of current transformer again through sampling resistor; Then produce the bipolarity ac sine wave voltage of certain amplitude at the output terminal of accurate binary channels amplifier; This bipolarity ac sine wave voltage converts the unipolarity sine wave signal into through resistance, exports to the AD ALT-CH alternate channel input port of processor chips, is calculated the line voltage amplitude of corresponding phase by processor chips.
4. photovoltaic DC-to-AC converter according to claim 3 and wind energy converter system three phase network voltage sample module; It is characterized in that; Said current transformer secondary coil is connected with protective resistance between the two ends, is connected with building-out capacitor between accurate binary channels amplifier reverse input end and the output terminal.
5. photovoltaic DC-to-AC converter according to claim 1 and wind energy converter system three phase network voltage sample module; It is characterized in that; Said zero passage capture circuit comprises amplifier A1B and comparator C M1; It is reverse that the bipolarity ac sine wave voltage output that the line voltage sample circuit produces is carried out equivalence through resistance R 6, R7 and amplifier A1B, and the signal after reverse is input to comparator C M1 in-phase input end through protective resistance R8 and filter capacitor C3, exports after the zero potential of the inverting input of itself and comparator C M1 is compared; Comparator C M1 output terminal connects and draws resistance R 12; Then the square-wave signal of generation of comparator C M1 output terminal and line voltage homophase is supplied with the mouth of catching of processor chips and is caught, and processor chips are calculated phase place and the frequency that obtains three phase network voltage respectively according to lock-on signal.
6. photovoltaic DC-to-AC converter according to claim 5 and wind energy converter system three phase network voltage sample module; It is characterized in that; Be connected to compensating circuit between said comparator C M1 in-phase input end and the output terminal; This compensating circuit comprises resistance R 11, diode D1, resistance R 11 1 termination comparator C M1 in-phase input ends, another terminating diode D1 negative pole, and diode D1 positive pole connects comparator C M1 output terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220113838 CN202486207U (en) | 2012-03-23 | 2012-03-23 | Three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system |
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| CN 201220113838 CN202486207U (en) | 2012-03-23 | 2012-03-23 | Three phrase network voltage sampling module of a photovoltaic inverter and wind energy convertor system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515414A (en) * | 2015-12-08 | 2016-04-20 | 九江赛晶科技股份有限公司 | Trigger pulse detection circuit for thyristor phase-shifted trigger rectifier |
| CN108562779A (en) * | 2017-12-15 | 2018-09-21 | 艾思玛新能源技术（江苏）有限公司 | The analysis of transport and placing device input pin signal, control method in the line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter |
| WO2018176184A1 (en) * | 2017-03-25 | 2018-10-04 | 深圳欣锐科技股份有限公司 | Input voltage signal sampling circuit in three-phase three-wire system pfc circuit |
| CN108847687A (en) * | 2018-07-19 | 2018-11-20 | 江苏信诺新能源有限公司 | Intelligent photovoltaic grid connection box with power grid voltage-stablizer |
-
2012
- 2012-03-23 CN CN 201220113838 patent/CN202486207U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515414A (en) * | 2015-12-08 | 2016-04-20 | 九江赛晶科技股份有限公司 | Trigger pulse detection circuit for thyristor phase-shifted trigger rectifier |
| WO2018176184A1 (en) * | 2017-03-25 | 2018-10-04 | 深圳欣锐科技股份有限公司 | Input voltage signal sampling circuit in three-phase three-wire system pfc circuit |
| CN108562779A (en) * | 2017-12-15 | 2018-09-21 | 艾思玛新能源技术（江苏）有限公司 | The analysis of transport and placing device input pin signal, control method in the line voltage sample circuit of non-isolated photovoltaic DC-to-AC converter |
| CN108562779B (en) * | 2017-12-15 | 2020-07-31 | 爱士惟新能源技术(江苏)有限公司 | Method for analyzing and controlling signals of input pin of operational amplifier in photovoltaic inverter power grid sampling |
| CN108847687A (en) * | 2018-07-19 | 2018-11-20 | 江苏信诺新能源有限公司 | Intelligent photovoltaic grid connection box with power grid voltage-stablizer |
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Free format text: FORMER OWNER: HUIZHOU TEN SOURCES SOLAR ELECTRICITY LTD. Effective date: 20150526 Owner name: HUIZHOU TEN SOURCES SOLAR ELECTRICITY LTD. Free format text: FORMER OWNER: TIANBAO ELECTRONIC (HUIZHOU) CO., LTD. Effective date: 20150526 |
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Address after: 516005 Shuikou Industrial Zone, Shuikou, Zhenlong, Guangdong, Huizhou Patentee after: TEN PAO ELECTRONICS (HUIZHOU) Co.,Ltd. Patentee after: HUIZHOU TEN SOURCES SOLAR ELECTRICITY Ltd. Address before: 516005 Shuikou Industrial Zone, Shuikou, Zhenlong, Guangdong, Huizhou Patentee before: TEN PAO ELECTRONICS (HUIZHOU) Co.,Ltd. Patentee before: HUIZHOU TEN SOURCES SOLAR ELECTRICITY Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150526 Address after: 516005 Dongjiang Industrial Zone, Shuikou subdistrict, Huicheng District, Guangdong, Huizhou Patentee after: HUIZHOU TEN SOURCES SOLAR ELECTRICITY Ltd. Address before: 516005 Shuikou Industrial Zone, Shuikou, Zhenlong, Guangdong, Huizhou Patentee before: TEN PAO ELECTRONICS (HUIZHOU) Co.,Ltd. Patentee before: HUIZHOU TEN SOURCES SOLAR ELECTRICITY Ltd. |
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